Hi the only one thing you can try without replacing the sim card reader is do you know when you put the simcard in if you push on the simcard with your finger so your pushing it down onto the contacts is fold up some paper so that it put pressure onto the simcard when you put the battery on as alot of times the contacts dont touch the sim card properly so putting some folded paper on top of sim card pushes it down onto the contacts properly.This solves the problem in most cases but it can be difficult to get right as if the paper isnt thick enough then it might not push it down hard enough to make contact.If after doing this it still dont work then this either means the sim cards no good but you could try it in another phone or it could be that the sim card reader is not connecting with the board properly and would need replacing.Make sure you check the contacts are clean on the sim card and the sim card reader to make sure this isnt problem.If you have not tried the sim card in a different phone then it could be the sim card is no good.Did this sim work in the phone before just in case the phone dont accept that network as you can get this message if this is the case.

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If you removed the sim card while the phone was powered on, it's possible that the card was damaged or the data was corrupted. You can try putting the sim card in an adapter and checking it with your computer. You may have to format the card again, then reinstall it in your phone, then power on your phone again.

Hello
The Simcard might gone bad due to some reason, try this sim to other phone, if it not works then issue another sim to your service provider.
otherwise the contact at phone may gone bad, needs repair.
Good Luck

hi,check your sim card first ,clean it...next step is clean your simcard interface by eraser or lacquer thinner ...if still not works ,the sim card driver of your phone is need to replace..this simcard driver is small chips that makes the simcard working ,if it is damage the simcard interface did not recognized the simcard...if the first and second solution not works ,go to a cellphone repair shop to change your sim card driver...i hope it will help you..thanks